USB Rechargeable Aluminum Mountain Bike Taillight -Light Weight Rear Light Fits All Bikes, Helmet or Backpack-Best Tail Light for Cycling, Running,Hiking WATER & SHOCK PROOF, lt Aircraft grade aluminum & rubber seals allows for protection from shocks, drops, and rainy daysIPX4. EASY OPERATION:The bicycle tail light charges from your computer or any device with a USB port. This Bike Light Only takes 2 hours to fully charge. Just press the lens to power on - 3 modes: High (3hrs run time), Low (6hrs run time), Strobe (50hrs run time). FULL SAFETY: The tail lights will always alert drivers of your presence by grabbing their attention with glaring red LEDs. See and be seen from miles away. EASY INSTALLATION: no tools required,Strap on anywhere in seconds and remove in seconds. Universal Fit For anything you can think of; Bicycles, Strollers, Dog leash, Hats, Helmets, Backpacks SALES SUPPORT: :If you aren't happy with the bicycle tail light for ANY reason within 30 days of purchase, let us know and you get your money back!